difference between super and this keyword in java.

Following are the notable differences between super() and this() methods in Java.

	super()	this()
Definition	super() - refers immediate parent class instance.	this() - refers current class instance.
Invoke	Can be used to invoke immediate parent class method.	Can be used to invoke current class method.
Constructor	super() acts as immediate parent class constructor and should be first line in child class constructor.	this() acts as current class constructor and can be used in parametrized constructors.
Override	When invoking a superclass version of an overridden method the super keyword is used.	When invoking a current version of an overridden method the this keyword is used.

Example

class Superclass {
   int age;
   Superclass(int age) {
      this.age = age;
   }
   public void getAge() {
      System.out.println("The value of the variable named age in super class is: " +age);
   }

Example

Live Demo
class Superclass {
   int age;
      Superclass(int age) {
      this.age = age;
   }
   public void getAge() {
      System.out.println("The value of the variable named age in super class is: " +age);
   }
}
public class Subclass extends Superclass {
   Subclass(int age) {
      super(age);
   }
   public static void main(String argd[]) {
      Subclass s = new Subclass(24);
      s.getAge();
   }
}

Output
The value of the variable named age in super class is: 24